Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Running Apex
Invoking Apex
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Actions
Approval Processing
Authentication
Chatter Answers and Ideas
Use Cases for the commercepayments Namespace
Connect in Apex
Connect in Apex Examples
Get Feed Elements From a Feed
Get Feed Elements From Another User’s Feed
Get Community-Specific Feed Elements from a Feed
Post a Feed Element
Post a Feed Element with a Mention
Post a Feed Element with Existing Content
Post a Rich-Text Feed Element with Inline Image
Post a Rich-Text Feed Element with a Code Block
Post a Feed Element with a New File (Binary) Attachment
Post a Batch of Feed Elements
Post a Batch of Feed Elements with a New (Binary) File
Define an Action Link and Post with a Feed Element
Define an Action Link in a Template and Post with a Feed Element
Edit a Feed Element
Edit a Question Title and Post
Like a Feed Element
Bookmark a Feed Element
Share a Feed Element (prior to Version 39.0)
Share a Feed Element (in Version 39.0 and Later)
Send a Direct Message
Post a Comment
Post a Comment with a Mention
Post a Comment with an Existing File
Post a Comment with a New File
Post a Rich-Text Comment with Inline Image
Post a Rich-Text Feed Comment with a Code Block
Edit a Comment
Follow a Record
Unfollow a Record
Get a Repository
Get Repositories
Get Allowed Item Types
Get Previews
Get a File Preview
Get Repository Folder Items
Get a Repository Folder
Get a Repository File Without Permissions Information
Get a Repository File with Permissions Information
Create a Repository File Without Content (Metadata Only)
Create a Repository File with Content
Update a Repository File Without Content (Metadata Only)
Update a Repository File with Content
Connect in Apex Features
Using ConnectApi Input and Output Classes
Understanding Limits for ConnectApi Classes
Packaging ConnectApi Classes
Serializing and Deserializing ConnectApi Objects
ConnectApi Versioning and Equality Checking
Casting ConnectApi Objects
Wildcards
Testing ConnectApi Code
Differences Between ConnectApi Classes and Other Apex Classes
Moderate Chatter Private Messages with Triggers
Moderate Feed Items with Triggers
Communities
Email
Metadata
Platform Cache
Salesforce Knowledge
Salesforce Files
Salesforce Connect
Salesforce Reports and Dashboards API via Apex
Salesforce Sites
Support Classes
Territory Management 2.0
Flows
Integration and Apex Utilities
Debugging, Testing, and Deploying Apex
Apex Language Reference
Appendices
Glossary
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Post a Rich-Text Feed Element with Inline Image

You can post rich-text feed elements with inline images and mentions two ways. Use the ConnectApiHelper repository on GitHub to write a single line of code, or use this example, which calls postFeedElement(communityId, feedElement). In this example, the image file is existing content that has already been uploaded to Salesforce. The post also includes text and a mention.
1String communityId = null;
2String imageId = '069D00000001INA'; 
3String mentionedUserId = '005D0000001QNpr'; 
4String targetUserOrGroupOrRecordId  = '005D0000001Gif0';
5ConnectApi.FeedItemInput input = new ConnectApi.FeedItemInput();
6input.subjectId = targetUserOrGroupOrRecordId;
7input.feedElementType = ConnectApi.FeedElementType.FeedItem;
8
9ConnectApi.MessageBodyInput messageInput = new ConnectApi.MessageBodyInput();
10ConnectApi.TextSegmentInput textSegment;
11ConnectApi.MentionSegmentInput mentionSegment;
12ConnectApi.MarkupBeginSegmentInput markupBeginSegment;
13ConnectApi.MarkupEndSegmentInput markupEndSegment;
14ConnectApi.InlineImageSegmentInput inlineImageSegment;
15
16messageInput.messageSegments = new List<ConnectApi.MessageSegmentInput>();
17
18markupBeginSegment = new ConnectApi.MarkupBeginSegmentInput();
19markupBeginSegment.markupType = ConnectApi.MarkupType.Bold;
20messageInput.messageSegments.add(markupBeginSegment);
21
22textSegment = new ConnectApi.TextSegmentInput();
23textSegment.text = 'Hello ';
24messageInput.messageSegments.add(textSegment);
25
26mentionSegment = new ConnectApi.MentionSegmentInput();
27mentionSegment.id = mentionedUserId;
28messageInput.messageSegments.add(mentionSegment);
29
30textSegment = new ConnectApi.TextSegmentInput();
31textSegment.text = '!';
32messageInput.messageSegments.add(textSegment);
33
34markupEndSegment = new ConnectApi.MarkupEndSegmentInput();
35markupEndSegment.markupType = ConnectApi.MarkupType.Bold;
36messageInput.messageSegments.add(markupEndSegment);
37
38inlineImageSegment = new ConnectApi.InlineImageSegmentInput();
39inlineImageSegment.altText = 'image one';
40inlineImageSegment.fileId = imageId;
41messageInput.messageSegments.add(inlineImageSegment);
42
43input.body = messageInput;
44
45ConnectApi.ChatterFeeds.postFeedElement(communityId, input);